1338 Datasheet | Renesas

Description The 1338 is a serial real-time clock (RTC) device that consumes ultra-low power and provides a full binary-coded decimal (BCD) clock/calendar with 56 bytes of battery backed Non-Volatile Static RAM. The clock/calendar provides seconds, minutes, hours, day, date, month, and year information. The clock operates in either the 24-hour or 12-hour format with AM/PM indicator. The end of the month date is automatically adjusted for months with fewer than 31 days, including corrections for leap year. Access to the clock/calendar registers is provided by an I2C interface capable of operating in fast I2C mode. Built-in Power-sense circuitry detects power failures and automatically switches to the backup supply, maintaining time and date operation. Typical Applications - Tele (Routers, Switches, Servers) - Handheld (GPS, Point of Sale POS Terminals) - Consumer Electronics (Set-Top Box, Digital Recording, Network Applications, Digital Photo Frames) - Office (Fax/Printers, Copiers) - Medical (Glueter, Medicine Dispensers) - Other (Thermostats, Vending Machines, Modems, Utility Meters) Features - Real-Time Clock (RTC) counts seconds, minutes, hours, day, date, month, and year with leap-year pensation valid up to 2100 - 56-byte battery-backed Non-Volatile RAM for data storage - Fast mode I2C serial interface - Automatic power-fail detect and switch circuitry - Programmable square-wave output - Packaged in 8-pin MSOP, 8-pin SOIC, or 16-pin SOIC (surface-mount package with an integrated crystal) - Industrial temperature range (-40°C to +85°C) Block Diagram Crystal inside package for 16-pin SOIC ONLY X1 X2 VCC GND VBAT 32.768k Hz Oscillator and Divider 1Hz / 4.096k Hz / 8.192k Hz / 32.768k Hz MUX/ Buffer Power Control Control Logic Clock, Calendar Counter SQW/OUT SCL SDA I2C Interface 56 Byte 1 Byte 7 Bytes RAM Control Buffer ©2008- 2023 Renesas Electronics Corporation December 14, 2023 1338 Datasheet Pin Assignment (8-pin MSOP/8-pin SOIC) Pin Assignment...